X w walter olaeser



UNITED STATES ra 'rnutr OFFICE.

' "WALTER enans'nnon zenoofiurn, NEW Toners.

FLEXIBLE mansrazann'r MATERIAL AND nnrnon or Maxine SAME.

No Drawing.

To all whom-it may concern:

Be it known that I, WALTER GLAEsER, a subject of the German Emperor, and a resident of Brooklyn, county of Kings,, and

State of New York, have invented a new and useful'lmprovement' in Flexible Trans.-

garent Material and Methods of Making" ame, of which the following is a specification, the principle of the invention being in which the herein explained and the best mode in which I have contemplated applying that prin-,

ciple, so as to distinguish it from other in ventions. The present invention,,relating as hn'dicated to a flexible transparent material and The followingdescription sets forth in detail one approved method of oarrymg out the invention, such disclosed method, however, constituting but one of various Ways principle of the invention may be used.

To make my improved material I take one part of glue, which may be eitl ierbleached r unbleached, and let the same soak in about one and one-half parts of water for at least twenty-four hours. At the end of this time another one and one-half parts of water are added and the mixture is heated by indirect heat, as in adouble boiler, until a clear solution is obtained. To

this solution I add from a uarter to one whole part of glycerin, audit is desirable that the glycerin be vigorously stirred into the mixture. The amount of glycerin which,

should be added is determined by the elasticity which is desired in the final product, and the eater amount of glycerin used,.the higher tfid elasticit of the finished material. This mixture of g ue, water and glycerin is now heated again over an indirect fire until its bulk amounts to about two andone-half parts when the mixture is allowed to cool un-' til it begins to form a relatively thin ielly.

Specification of Letters Patent.

glued paper,

"and materially Patented May 6, i919.

Application filed September 19, 191?. herial No. 192,181.

In ,aseparate container one-half part of strong formaldehyde is mixed with an equal amount of Water and this mixture is then stirred quickly into the cold glue and glyc-' erin mixture, and the resultingmaaterial is spreadon 'a cold glass plate toanydesired thickness. It is desirable that the spreading operation be performed as rapidly as possible as otherwise the mixture may harden before it can be smoothed.

If the screen to be made is of very great size it is desirable to reinforce the mixture on the glass plate by placing a sheet of unbolting silk or similar material onthe. film on the plate, and this material is then covered by a second .layer of the mixture.

properly spread "and After the solution has been applied to the plate it should bekept in air' that is free from. dust for a short time, about fifteen -minutes or so, until thematerial has become somewhat hard, when the plate and,

coating are placed in a drying closet and dried at about 200 degrees F. Under this drying temperature the material hardens toughens and forms a very efi'ective screen. e

Other forms may be employed embodying the features of my invention instead of the one here explained, change 'bein made in the form or construction, provi ed the elements stated by the following claim or the equivalent of such stated elements be-employed, whether produced by my preferred,

method or by others embodying steps equivalent to those stated in the following claim.

I therefore particularly -point out and distinctly claim as my invention In a method of making a flexible transparent material, the steps whlch c nsist in soaking one part of glue in one and ne half parts of water, adding another one and one half parts of water and heating the mixture indirectly until a clear solution is formed, stirring into the solution one fourth part or more of glycerin, heatin such mixture to a bulk of two and one he f parts, cooling the same and adding formaldehyde.

Sgned by me, this 13th day of September, 191

WALTER GLAESER. 

